To exchange OST to PST in the best way users are recommended to install Kernel for OST to PST. This third-party tool is reliable and efficient to perform such conversion without any hazel. To ensure performance download its trial version.

You can divide PST files using Kernel for PST Split tool. It provides easy options to split large size PST files. It can also split password-protected PST files. You should be aware of the password though. Its free demo version available.